Answer:
president pro tempore of the Senate
In both wars, the governments of the world had to try to fix the what had been destroyed.
America, on the other hand, had little to no damage in ww1 but had plenty in ww2. They spent most of the time after ww1 partying and making the stock market crash. While after ww2, they tried to get communism out of the new countries.
Answer:
Trains
Explanation:
The expansion of the railroad system allowed goods and people to move around faster than ever before
Not sure what the options are but there was a huge wave of immigration during that era.